Sadly, Flash is the red-neck step-child everyone loves to abuse in the internet world. Its an easy way to induce video across the internet world... but it has its drawbacks.
Yes, I have seen a similar annoying message pop-up in my Chrome browser. It asked me to do a similar thing---I believe its a man-in-the-middle attack to hack your system.
Google has posted a "critical fix" for this. Usually, that means you (and I) need to heed it.
https://support.google.com/chrome/answer/6258784
While surfing through material and games. I suddenly received a yellow alert pop up in my search window with this notice... Has anyone else seen this or have any feed back on it?
NPAPI plugins don't work on Chrome version 42 and higher
Plugins allow extra features to be added to browsers. For example, you can watch certain types of videos or play a game that’s on a webpage.
NPAPI support has ended
In the past, many plugins were developed using an older system called NPAPI. Today fewer sites are using NPAPI plugins and they can sometimes cause security risks on websites.
To make browsing with Chrome safer, faster, and more stable, we’re ending support for NPAPI pluginswith Chrome version 42.
Which plugins are supported
Plugins that use a newer, more secure system called Pepper API (PPAPI) will continue to work, including those that come with Chrome, like Adobe Flash and PDF Viewer. If Flash or PDF doesn’t automatically load, make sure that you have the PPAPI plugin version enabled in Chrome.
Plugins that use NPAPI, including Silverlight, Java, and Unity, won’t work
How to enable PPAPI plugins
chrome://plugins
and press Enter.How to temporarily enable NPAPI plugins
If you must use a NPAPI plugin, there’s a temporary workaround that will work until Chrome version 45 is released later in 2015:
After the release of Chrome version 45, you’ll need to use an alternate web browser to load content that requires a NPAPI plugin.